Abstract
Based on the concept of superoscillation, one kind of transmitarray (TA) antenna is proposed to achieve far-field super-resolution focusing in single-frequency (10 GHz) for computational microwave imaging systems. The TA consists of an illuminating feed source and double-layer flat transmitting surfaces, which includes a passive TA (PTA) and a reconfigurable TA (RTA) respectively. The PTA is designed to convert the spherical phase front from the feed to a planar phase front. Dynamic metasurface apertures (DMAs) were obtained by randomly coding RTA aperture. The experimental results of this paper suggest that the double-layer TA antenna can generate a multitude of highly uncorrelated and far-field super-resolution radiation patterns, that is, it has the ability to capture more high-frequency detail information in the scene which cannot be captured by traditional computational imaging systems. In addition, this paper proposes a method for the rapid design of PTA and RTA by extracting the incident field data and using MATLAB to perform numerical approximate calculation. Compared with the calculation depends entirely on full-wave simulation software, such as ANSYS Electronics Desktop, our method ensures a certain accuracy and significantly shorten the period of antenna design.
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